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Equity - Share-based payments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | $ 6 | $ 4 | $ 18 | $ 14
Income tax benefit | (1) |  | (2) | (1)
Total share-based compensation expense, net of income taxes | 5 | 4 | 16 | 13
Stock options |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 1 |  | 3 | 2
Total share-based compensation expense, net of income taxes | 1 |  | 3 | 2
Restricted stock units (RSUs) |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 3 | 2 | 9 | 7
Income tax benefit |  |  | (1) | (1)
Total share-based compensation expense, net of income taxes | 3 | 2 | 8 | 6
Performance shares and other share-based awards |  |  |  |
Share-based compensation expense |  |  |  |
Pre-tax compensation expense | 2 | 2 | 6 | 5
Income tax benefit | (1) |  | (1) |
Total share-based compensation expense, net of income taxes | $ 1 | $ 2 | $ 5 | $ 5

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